Notes for Computer Information Technology 160
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October 10 - IP


  • IP: v4 and v6
    • Class A, B, C, D
    • CIDR
  • Mask
    • umask
    • mask
  • IP (protocols)
    • ICMP (ping, traceroute)
    • UDP
    • TCP
    • DNS
  • Commands
    • host
    • nslookup
    • ifconfig

The Internet

There are multiple ways to get to where you want to go.

  1. A computer makes a request for some information from a location.
  2. The receiving end understands the request and sends the information back.

When you call someone, you look them up in your contacts, when you go to, your computer looks up its ip address in Domain Name System (DNS)

An ip (v4) address is always in this format: XXX.XXX.XXX.XXX, for example,